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Cincinnati Society of Natural History. 



the rudimentary stipes are hidden beneath the leafy expan- 

 sions. In all the forms, however, may be uncovered the 

 spiniform tubules mingled with the slender threads. This is 



Trichamphora oblong a B. & C. Tilmadoche oblo?iga of Rosta- 

 finski's monograph, and Physarella mirabilis Peck. 



V. CYTIDIUM Morgan. Gen. nov. Sporangium globose 

 or rarely ellipsoidal, stipitate ; the wall a thin membrane, 

 with an external layer of minute granules of lime, rupturing 

 irregularly. Stipe more or less elongated, tapering upward 

 and entering the sporangium as a columella. Capillitium of 

 slender tubules, arising from the columella, repeatedly 

 branching and anastomosing to form a regular net-work, the 

 extremities attached on all sides to the wall of the sporan- 

 gium, the tubules containing at intervals nodules of lime. 

 Spores globose, violaceous. 



This genus is readily distinguished from Physarum by the 

 columella, which gives origin to the capillitium ; this feature 

 indicates a relationship to Didymium and to Lampro derma. 



§i. Eucytis. Sporangium globose, the columella not 

 reaching its center. 



i. Cytidium puixherrimum B. & R. Sporangium 

 globose, stipitate; the wall a thin lilac-tinted membrane, with 

 a dense closely adherent layer of granules of lime, dark 

 purple or wine-colored. Stipe long, erect, dark purple to 

 purplish black, tapering upward and entering the sporangium 

 as a slight obtuse columella. Capillitium of slender lilac 

 tinted threads, forming a dense net-work of very small meshes, 

 with slight expansion at the angles; the nodules of lime very 

 small, numerous, dark purplish or vinose in color, ellipsoidal 

 or obtusely angular. Spores globose, even, lilac, 7-9 mic. in 

 diameter. 



Growing on old wood. Sporangium .4~.5 mm. in diameter, 

 the stipe two or three times as long; the lime-nodules about 

 the size of the spores. The purple stain, which the sporangia 

 leave on white paper, is made by the granules of lime ; the 



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